Artifacts/false discontinuities in `ImplicitFunction`

Nobody has claimed this yet.

## Description of bug / unexpected behavior
Looking closely at the output from `ImplicitFunction` you'd often see many false discontinuities. For example, if you look closely at [the example from the docs](https://docs.manim.community/en/stable/reference/manim.mobject.functions.ImplicitFunction.html#implicitfunctionexample), you'd see many points where the curve breaks.

In this example:

```py
class ImplicitFunctionDemo(Scene):
def construct(self):
plane = NumberPlane()
curve = ImplicitFunction(
lambda x, y: (x**2 + y**2)**2 - 42*(x**2 - y**2),
color=YELLOW,
max_quads=10000,
)
self.add(plane)
self.add(curve)
```

even with 10000 quads, discontinuities can still be seen:


## Expected behavior

## How to reproduce the issue

Code for reproducing the problem

```py
Paste your code here.
```

## Additional media files

Images/GIFs

## Logs
Terminal output

```
PASTE HERE OR PROVIDE LINK TO https://pastebin.com/ OR SIMILAR
```

## System specifications

System Details

- OS (with version, e.g Windows 10 v2004 or macOS 10.15 (Catalina)):
- RAM:
- Python version (`python/py/python3 --version`):
- Installed modules (provide output from `pip list`):
```
PASTE HERE
```

LaTeX details

+ LaTeX distribution (e.g. TeX Live 2020):
+ Installed LaTeX packages:

FFMPEG

Output of `ffmpeg -version`:

```
PASTE HERE
```

## Additional comments

Start by locating the `ImplicitFunction` implementation and reproduce the documentation example with `max_quads=10000`. Trace how the curve is sampled and rendered, then verify that the false discontinuities are gone in the same example; the issue names no specific test, file, or system details.

Written by the indexing model from the issue text.